110 lines
3.1 KiB
Bash
110 lines
3.1 KiB
Bash
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#!/bin/sh
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# Script to create/update include/generated/autoksyms.h and dependency files
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#
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# Copyright: (C) 2016 Linaro Limited
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# Created by: Nicolas Pitre, January 2016
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 2 as
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# published by the Free Software Foundation.
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# Create/update the include/generated/autoksyms.h file from the list
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# of all module's needed symbols as recorded on the third line of
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# .tmp_versions/*.mod files.
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#
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# For each symbol being added or removed, the corresponding dependency
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# file's timestamp is updated to force a rebuild of the affected source
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# file. All arguments passed to this script are assumed to be a command
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# to be exec'd to trigger a rebuild of those files.
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set -e
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cur_ksyms_file="include/generated/autoksyms.h"
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new_ksyms_file="include/generated/autoksyms.h.tmpnew"
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info() {
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if [ "$quiet" != "silent_" ]; then
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printf " %-7s %s\n" "$1" "$2"
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fi
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}
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info "CHK" "$cur_ksyms_file"
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# Use "make V=1" to debug this script.
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case "$KBUILD_VERBOSE" in
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*1*)
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set -x
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;;
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esac
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# We need access to CONFIG_ symbols
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case "${KCONFIG_CONFIG}" in
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*/*)
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. "${KCONFIG_CONFIG}"
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;;
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*)
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# Force using a file from the current directory
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. "./${KCONFIG_CONFIG}"
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esac
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# In case it doesn't exist yet...
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if [ -e "$cur_ksyms_file" ]; then touch "$cur_ksyms_file"; fi
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# Generate a new ksym list file with symbols needed by the current
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# set of modules.
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cat > "$new_ksyms_file" << EOT
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/*
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* Automatically generated file; DO NOT EDIT.
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*/
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EOT
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[ "$(ls -A "$MODVERDIR")" ] &&
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sed -ns -e '3{s/ /\n/g;/^$/!p;}' "$MODVERDIR"/*.mod | sort -u |
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while read sym; do
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if [ -n "$CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX" ]; then
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sym="${sym#_}"
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fi
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echo "#define __KSYM_${sym} 1"
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done >> "$new_ksyms_file"
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# Special case for modversions (see modpost.c)
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if [ -n "$CONFIG_MODVERSIONS" ]; then
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echo "#define __KSYM_module_layout 1" >> "$new_ksyms_file"
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fi
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# Extract changes between old and new list and touch corresponding
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# dependency files.
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changed=$(
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count=0
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sort "$cur_ksyms_file" "$new_ksyms_file" | uniq -u |
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sed -n 's/^#define __KSYM_\(.*\) 1/\1/p' | tr "A-Z_" "a-z/" |
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while read sympath; do
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if [ -z "$sympath" ]; then continue; fi
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depfile="include/config/ksym/${sympath}.h"
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mkdir -p "$(dirname "$depfile")"
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touch "$depfile"
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# Filesystems with coarse time precision may create timestamps
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# equal to the one from a file that was very recently built and that
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# needs to be rebuild. Let's guard against that by making sure our
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# dep files are always newer than the first file we created here.
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while [ ! "$depfile" -nt "$new_ksyms_file" ]; do
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touch "$depfile"
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done
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echo $((count += 1))
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done | tail -1 )
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changed=${changed:-0}
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if [ $changed -gt 0 ]; then
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# Replace the old list with tne new one
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old=$(grep -c "^#define __KSYM_" "$cur_ksyms_file" || true)
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new=$(grep -c "^#define __KSYM_" "$new_ksyms_file" || true)
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info "KSYMS" "symbols: before=$old, after=$new, changed=$changed"
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info "UPD" "$cur_ksyms_file"
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mv -f "$new_ksyms_file" "$cur_ksyms_file"
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# Then trigger a rebuild of affected source files
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exec $@
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else
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rm -f "$new_ksyms_file"
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fi
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